 Dual Tone Multi-Frequency (DTMF) SoftwareCompany Description:GAO's Dual Tone Multi-Frequency (DTMF) Software is an implementation of a Dual-Tone Multi-Frequency (DTMF) generator and decoder. DTMF is an international signaling standard for touch-tone telephones. The DTMF generator generates standard telephone digits as the sum of sinusoids corresponding to a frequency table for each digit. The DTMF decoder will take a digital signal as input and produce the decoded digit. GAO's DTMF software generates and decodes 8 kHz PCM samples.DTMF has a variety of uses in telephone systems. It is widely used in interactive control applications such as telephone banking, electronic mail systems, and many other menu-driven operations that respond to digits entered from a telephone. GAO DTMF generator and decoder consists of four user-callable functions that perform the generating, decoding, and initialization operations. FEATURES: -Fully compliant to EIA / TIA - 464B 6.1.4 and 6.1.5 .1 to 6.1.5.5. -User-callable functions. -Implemented in assembly and C. -Low data and program memory requirements. Worldwide Headquarters:
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